Character Decimal Typing Code Entity Name
; 894 ;   GREEK QUESTION MARK
΄ 900 ---   GREEK TONOS (present in WGL4)
΅ 901 ---   GREEK DIALYTIKA TONOS (present in WGL4)
Ά 902 `A   GREEK CAPITAL LETTER ALPHA WITH TONOS (present in WGL4)
· 903 ---   GREEK ANO TELEIA (present in WGL4)
Έ 904 `E   GREEK CAPITAL LETTER EPSILON WITH TONOS (present in WGL4)
Ή 905 `H   GREEK CAPITAL LETTER ETA WITH TONOS (present in WGL4)
Ί 906 `I   GREEK CAPITAL LETTER IOTA WITH TONOS (present in WGL4)
Ό 908 `O   GREEK CAPITAL LETTER OMICRON WITH TONOS (present in WGL4)
Ύ 910 `U   GREEK CAPITAL LETTER UPSILON WITH TONOS (present in WGL4)
Ώ 911 `W   GREEK CAPITAL LETTER OMEGA WITH TONOS (present in WGL4)
ΐ 912 `:i or :`i   GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS (present in WGL4)
Α 913 A Α GREEK CAPITAL LETTER ALPHA (present in WGL4 and in Symbol font)
Β 914 B Β GREEK CAPITAL LETTER BETA (present in WGL4 and in Symbol font)
Γ 915 G Γ GREEK CAPITAL LETTER GAMMA (present in WGL4 and in Symbol font)
Δ 916 D Δ GREEK CAPITAL LETTER DELTA (present in WGL4 and in Symbol font)
Ε 917 E Ε GREEK CAPITAL LETTER EPSILON (present in WGL4 and in Symbol font)
Ζ 918 Z Ζ GREEK CAPITAL LETTER ZETA (present in WGL4 and in Symbol font)
Η 919 E Η GREEK CAPITAL LETTER ETA (present in WGL4 and in Symbol font)
Θ 920 Q Θ GREEK CAPITAL LETTER THETA (present in WGL4 and in Symbol font)
Ι 921 I Ι GREEK CAPITAL LETTER IOTA (present in WGL4 and in Symbol font)
Κ 922 K Κ GREEK CAPITAL LETTER KAPPA (present in WGL4 and in Symbol font)
Λ 923 L Λ GREEK CAPITAL LETTER LAMDA (present in WGL4 and in Symbol font)
Μ 924 M Μ GREEK CAPITAL LETTER MU (present in WGL4 and in Symbol font)
Ν 925 N Ν GREEK CAPITAL LETTER NU (present in WGL4 and in Symbol font)
Ξ 926 X Ξ GREEK CAPITAL LETTER XI (present in WGL4 and in Symbol font)
Ο 927 O Ο GREEK CAPITAL LETTER OMICRON (present in WGL4 and in Symbol font)
Π 928 P Π GREEK CAPITAL LETTER PI (present in WGL4 and in Symbol font)
Ρ 929 R Ρ GREEK CAPITAL LETTER RHO (present in WGL4 and in Symbol font)
Σ 931 S Σ GREEK CAPITAL LETTER SIGMA (present in WGL4 and in Symbol font)
Τ 932 T Τ GREEK CAPITAL LETTER TAU (present in WGL4 and in Symbol font)
Υ 933 U Υ GREEK CAPITAL LETTER UPSILON (present in WGL4 and in Symbol font)
Φ 934 F Φ GREEK CAPITAL LETTER PHI (present in WGL4 and in Symbol font)
Χ 935 C Χ GREEK CAPITAL LETTER CHI (present in WGL4 and in Symbol font)
Ψ 936 Y Ψ GREEK CAPITAL LETTER PSI (present in WGL4 and in Symbol font)
Ω 937 W Ω GREEK CAPITAL LETTER OMEGA (present in WGL4 and MacRoman, and in Symbol font)
Ϊ 938 :I   GREEK CAPITAL LETTER IOTA WITH DIALYTIKA
Ϋ 939 :U   GREEK CAPITAL LETTER UPSILON WITH DIALYTIKA
ά 940 `a   GREEK SMALL LETTER ALPHA WITH TONOS
έ 941 `e   GREEK SMALL LETTER EPSILON WITH TONOS
ή 942 `h   GREEK SMALL LETTER ETA WITH TONOS
ί 943 `i   GREEK SMALL LETTER IOTA WITH TONOS
ΰ 944 `:u or :`u   GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS
α 945 a α GREEK SMALL LETTER ALPHA (present in WGL4 and in Symbol font)
β 946 b β GREEK SMALL LETTER BETA (present in WGL4 and in Symbol font)
γ 947 g γ GREEK SMALL LETTER GAMMA (present in WGL4 and in Symbol font)
δ 948 d δ GREEK SMALL LETTER DELTA (present in WGL4 and in Symbol font)
ε 949 e ε GREEK SMALL LETTER EPSILON (present in WGL4 and in Symbol font)
ζ 950 z ζ GREEK SMALL LETTER ZETA (present in WGL4 and in Symbol font)
η 951 e η GREEK SMALL LETTER ETA (present in WGL4 and in Symbol font)
θ 952 q θ GREEK SMALL LETTER THETA (present in WGL4 and in Symbol font)
ι 953 i ι GREEK SMALL LETTER IOTA (present in WGL4 and in Symbol font)
κ 954 k κ GREEK SMALL LETTER KAPPA (present in WGL4 and in Symbol font)
λ 955 l λ GREEK SMALL LETTER LAMDA (present in WGL4 and in Symbol font)
μ 956 m μ GREEK SMALL LETTER MU (present in WGL4 and in Symbol font)
ν 957 n ν GREEK SMALL LETTER NU (present in WGL4 and in Symbol font)
ξ 958 x ξ GREEK SMALL LETTER XI (present in WGL4 and in Symbol font)
ο 959 o ο GREEK SMALL LETTER OMICRON (present in WGL4 and in Symbol font)
π 960 p π GREEK SMALL LETTER PI (present in WGL4 and MacRoman, and in Symbol font)
ρ 961 r ρ GREEK SMALL LETTER RHO (present in WGL4 and in Symbol font)
ς 962 V or s ς GREEK SMALL LETTER FINAL SIGMA (present in WGL4 and in Symbol font)
σ 963 s σ GREEK SMALL LETTER SIGMA (present in WGL4 and in Symbol font)
τ 964 t τ GREEK SMALL LETTER TAU (present in WGL4 and in Symbol font)
υ 965 u υ GREEK SMALL LETTER UPSILON (present in WGL4 and in Symbol font)
φ 966 f φ GREEK SMALL LETTER PHI (present in WGL4 and in Symbol font)
χ 967 c χ GREEK SMALL LETTER CHI (present in WGL4 and in Symbol font)
ψ 968 y ψ GREEK SMALL LETTER PSI (present in WGL4 and in Symbol font)
ω 969 w ω GREEK SMALL LETTER OMEGA (present in WGL4 and in Symbol font)
ϊ 970 :i   GREEK SMALL LETTER IOTA WITH DIALYTIKA (present in WGL4)
ϋ 971 :u   GREEK SMALL LETTER UPSILON WITH DIALYTIKA (present in WGL4)
ό 972 `o   GREEK SMALL LETTER OMICRON WITH TONOS (present in WGL4)
ύ 973 `u   GREEK SMALL LETTER UPSILON WITH TONOS (present in WGL4)
ώ 974 `w   GREEK SMALL LETTER OMEGA WITH TONOS (present in WGL4)

The symbol for the now defunct Greek currency is not within the Greek range but is included here for completion's sake:
 

Character Decimal Typing Code Entity Name
8367 ---   DRACHMA SIGN


But the Euro sign will probably come in handier these days:

Character Decimal Typing Code Entity Name
8364 --- € EURO SIGN