sitelen Lasina is a common toki pona name for the Latin alphabet. According to the 2022 toki pona census, it's by far the most commonly used writing system for toki pona, being preferred by about 3 times as many people as the bespoke sitelen pona.
The toki pona subset of the Latin alphabet consists of 14 letters:
Capital letters aren’t used in any dictionary words, only in names and proper nouns. Thus, most text is completely lowercase. All letters are pronounced as in the International Phonetic Alphabet.