Phofsit Daibuun (普實臺文, PSDB) is an orthography in the Latin alphabet for Taiwanese Hokkien based on Modern Literal Taiwanese. It allows for the use of the ASCII character set to indicate the proper lexical tones without any subsidiary scripts or diacritic symbols.

Nasalized syllables are indicated by "v" preceding the syllable nucleus. Except for b, j, l, which do not precede nasalized vowels, and m and n, which are already nasals.

Regarding the pronunciation of "oi":