On type:

abu
letteral for a.
denpa bu
letteral: Lojban "." character.
ebu
letteral for e.
ibu
letteral for i.
joibu
letteral: ampersand character; especially used in standing for a mixed connective.
obu
letteral for o.
pau bu
letteral: '?' symbol
saibu
letteral: '!' symbol
slaka bu
letteral: Lojban "," character.
ubu
letteral for u.
uibu
letteral: happiness symbol (letteral).
ybu
letteral for y.
zo'obu
letteral: humor symbol, ":-)" and its related forms expressing humor (letteral).