The dots over i and j are called tittles. This is what wikipedia says:
The tittle first appeared in Latin manuscripts in the 11th century, to distinguish the letter i from strokes of nearby letters. Although originally a larger mark, it was reduced to a dot when Roman-style typefaces were introduced.
The 'u' or 'j' with two dots over are used in some languages,hungarian, Portuguese, to represent a different vowel sound to the English sound.
I think they represent a vowel that is more 'fronted' than the English vowel.
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j
What no they mean
Umlauts
uncompleted sentence.
it has adkdgbsgbsd'g SD