Gematria
Every Hebrew letter is also a number. Add a word's letters together and you have its value — the gateway to the classic word connections.
א–ט
1–9
י–צ
10–90
ק–ת
100–400
Word → Number
ש300ל30ו6ם40
376total value
Number → Letters
תשע
770 = תשע״ע — the Rebbe's address at 770 Eastern Parkway. 15 and 16 are written ט״ו and ט״ז so we never spell the Name of G‑d.