on the above pictures you would see similarity in symbolism
Focus your attantion on cross with four identical signs.
Now, those four signs, which real form you see on the Serbian Coat of arms (on Serbian flag) represents- OCILA (eng. firesteels).
In the fields divided by cross are positioned four firesteels, turned back to each other (not always though). Firesteels are `tool` which our ancestors used to start a fire.

That is same as Svastika- ancient Slavic/Proto Slavic (read Sarmatian) symbol.
They also had some kind of `mystic` meaning. There are few explanations of this symbol but, descriptions of old chronicles say that OCILA (firesteels) represent symbol of light (which is even obvious).
Meaning of word OCILA on Serbian is more then appropriate and absolutely support thesis about mystical importance of symbol. OCILA on Serbian means `from fathers` (od OČEVA). So, OCILA were firesteels which because of importance of fire, turned into spiritual and religious symbol of our honorable ancestors.
This information is my gift to Poles here, which i deeply respect