I'm looking for standard IPA but every book, even dictionaries implement it differently.
for example [ɑ] and [ɑ:] or this symbol [ɛ] vs [e].
Some books omit the [i] sound which is the last sound of word happy, and some books say that this symbol equals [iː].
This also happens to [uː]. I know that colons like symbols are for length, but why is there so many differences? Even Wikipedia says:
Please note that several of these symbols are used in ways that are specific to Wikipedia and differ from those used by dictionaries.
Where is the standard form that every text should obey?
And what's the role of these ones in the game? Bold ones.