There are several prefixes in the Hebrew language which are appended to regular words to introduce a new meaning. In Hebrew, the letters that form those prefixes are called "formative letters" (Hebrew: אוֹתִיּוֹת הַשִּׁמּוּשׁ, Otiyot HaShimush). Eleven of the twenty-two letters of the Hebrew alphabet are considered Otiyot HaShimush. These letters are Aleph (א), Bet (ב), He (ה), Vav (ו), Yud (י), Kaf (כ), Lamed (ל), Mem (מ), Nun (נ), Shin (ש), and Tav (ת). A mnemonic to remember these letters is איתן משה וכלב (Eitan, Moshe, v'Kalev), which translates to "Ethan, Moses, and Caleb."
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Otiyot haShimush
Prefixes in Hebrew serve multiple purposes. A prefix can serve as a conjunction, preposition, definite article, or interrogative. Prefixes are also used when conjugating verbs in the future tense and for various other purposes.
Non Otiyot HaShimush
These prefixes (Hebrew: תְּחִלִּית t'hilit) often come from loanwords from English (Latin, Greek, etc...) which are especially prevalent with technical and academic terms. Other prefixes are native to Hebrew (ex. rav). When the Hebrew prefix does not line up in similarity to the English, Greek, or Latin one that is because it is of Hebrew origin.