Any signals use may differ between auctions, auctioneers, ringmen, etc.
There are no specific standards. An example may be that the bid is at two, twenty or even two hundred, and a ringman may be holding two fingers to indicate the bid and then three to the bidder, as to ask if they want to go three or thirty or three hundred.
Another ringman might signal 4 and then 5, as to indicate 45 or 450... yet you might think he's indicating the bid is at 4 and asking for 5.
Unfortunately, it comes down to learning how that particular auction runs and even the particular individuals nuances.
Do you read lips? If so, you could talk to the ringman that is working near you and let him/her know your problem. They probably would make sure to look your way and form the words with their mouth, so that you might better understand what bid they are looking to get.
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