# \u and 4 hex digits
c_ruble = '\u20BD' # ₽
c_lambda = '\u03BB' # λ
# By the name from the Unicode table
c_lambda_name = '\N{GREEK SMALL LETTER LAMDA}' # λ
# \U and 8 hex digits: beyond \uFFFF
c_smile = '\U0001F600' # grinning face
print(f"{c_ruble = }")
print(f"{c_lambda = }")
print(f"{c_lambda_name = }")
print(f"{c_smile = }")