Answer:
I am the only thing that place today before yesterday. (one word)
I am a type of weapon for SCI-FI characters
Alone I am 24th with a friend I am 20. Another friend and I am unclean.
I am pronounced as one letter written with three. I come in blue black brown or grey. Reverse me and I read the same either way.
I begin with the letter βiβ, if you add βaβ in front of me, I become a new word with a different meaning, but still sounds exactly the same. What word am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?