Am I the only person here who believes (based on ALL of the rules shared in this thread + my previous knowledge/experience) that the reason there is so much back-and-forth on this topic is because the answer to the original question is "it depends whether it's pre or post flop?"
I've mentioned it here a couple times, but no one has directly responded to it. Others have said what I have said on both sides (call/raise), but isn't there a piece of information that easily determines the answer to this question?
A raise in NLHE by definition is not "at least double the amount of the last completed bet." If it were, the answer to the original question would easily be "Call," because two $5 chips produces an amount less than double the last bet of $6 (required minimum raise of $12 or more, and at least two chips if not announcing a raise verbally).
A raise by definition is "at least the amount of the last raise amount." This means that a blind level of $1/$3 could see a raise to $6 (which is a raise amount of $3) and another raise amount of $4 to $10, and all of that be legally achieved without any player saying a word to another player or the dealer. As long as the raise to $10 happens with more than 1 chip, it is in fact a legal raise and doesn't need to be verbalized.
The only people here that don't agree that two $5 chips constitutes a raise (in this specific preflop situation) either:
1. Don't know the real rules
2. Know the rules and don't like the rules, hence personal house rule overruling, or
3. Know the rules and are trolling in this thread.
Everyone who says "why not just ask what the player meant" are absolutely correct, because most players don't know that you can raise smaller than double the last completed bet and it be legal.
The rules are the rules, and to me the rules are clear... but what is hardly ever clear is the intention of your players and whether they even understand the rules... so honestly, who cares!!!??? As long as the host is consistent, then it doesn't even matter in the long run. Make your players double the last bet preflop... fine... just do it every time. Or, let players min-raise like the rule says they can... fine...
But once again, those here who are adamant about those two $5 chips are a call really are way way WAY wrong (in this particular example).