Did anyone say BIG_SHOUTY_WORDS???

I'm jumping into this with @tojofo as I must admit that almost in any language I was programming constants are usually BIG_SHOUTY_WORDS.
```
#define I_LIKE_TO_SHOUT "because it is fun"

declare -r THIS_IS_A_CONSTANT='kthx bye'
```

It's pretty cross-language AFAIK.