during World War II in Sweden, "77" was used as a shibboleth, because its difficult pronunciation made it easy to determine whether the speaker was Swedish, Norwegian, or German
the number of cards in a standard deck of playing cards
Moon Zero Two is a 1969 crime sci-fi film about a group of criminals intent on hijacking a small asteroid made of sapphire
the word "sorrow" appears 70 times in the JKV Bible