Re: Why are there 3 dimensions?
Hence three is a fundamental number, the Trinity etc.
So it's a number invented by the Catholic Church some time in the 3rd century CE?
(It's what they call an 'Inferred[1] Doctrine' - one for which there is no direct evidence but is created to try to explain some parts of the text. Except it kinda destroys a whole bunch of others..)
Hebrew Yod is a dot
Err.. no. It's more akin to an apostrophe (but bigger). You do (in Modern Hebrew) get vowel points which are dots (which can be above or below the letters that they affect) but they didn't exist in Biblical Hebrew (which didn't have vowels at all - which leads to amusement when evangelicals insist on saying 'Jehovah'[2] or 'Yahweh' for YHWH since we can't be sure about how the tetragammnaton was acually pronounced - especially as the ancient Hebrews used 'adonai' instead so as to avoid blashphemy..).
[1] Nothing to do with cats.
[2] BiblicalHebrew didn't have the 'J' sound. Strictly speaking, 'Jesus' would have been 'Yeshua'..