# What does the symbol [=] mean?

1. Oct 14, 2016

### emeraldskye177

1. The problem statement, all variables and given/known data

What does the symbol [=] mean?

2. Relevant equations

3. The attempt at a solution

I tried looking this up online but can't find anything. I think it has something to do with dimensional analysis or denoting the units of a quantity. E.g., is it valid to write:

t [=] seconds

?

2. Oct 14, 2016

### Staff: Mentor

Could you provide some context or a few examples?
As long as the brackets are meant to belong to the sign, I have never seen this before. It might well be, that it denotes a dimension, as it would be in, e.g. $[\vec{p}] = MLT^{-1}$ (mass length / time) for momentum. A notation I've seen before. But I don't think it is in general use. And I can't see how $t[=] \text{ seconds }$ would make sense. Eventually $[t] = \text{ seconds }$.

3. Oct 15, 2016

### CWatters

Google can't find [=] anywhere so very unlikely it exists.