I can confirm that is what those are.
I thought the surveyor's mark had no ring about it.
There is a symbol similar to the gun-sight symbol on Palin's map which is used in surveying and building. It is normally associated with the site TBMs (temporary benchmarks) which are used to establish reference elevations. Most of the time it will only be seen in the civil pages of a set of building plans.
"Similar" is an operative term here. The survey symbol in question is a
small circle divided into quadrants by lines which extend
well beyond the circle's perimeter. Very unlike the icon Palin used with a large circle and lines which only barely cross the perimeter. In addition it is often not simple and unadorned. Often two of the diagonally opposite quadrants within the circle will be blacked in. It would not be confused with the gun-sight icon on the Palin map by anyone whose professional background would allow their recognition of it as a surveying symbol.
Which brings up another point. That group is relatively restricted. Even within the building industry there is a fairly substantial percentage of professionals who would have no clue that that is what it meant. I say this because I have had occasion to enlighten more than a few of them on the subject personally.
What this means is that very, very few of the people who look at Palin's map will have any idea at all that there might be any similarity to an obscure surveying symbol, and the very few who might have the knowledge to see that rather tenuous similarity will still have no doubts what the intended connotations were of the one used on that map.
For Palin to suggest otherwise is a specious evasion, which doesn't surprise me coming from her. What does surprise me is that there was anyone in her entourage with enough experience with anything as practical as surveying and building to suggest such a patently fatuous claim in the first place.
It did make me laugh when I first read her claim, though. She would do herself better if she would avoid such dissembling altogether and simply concede that such exhortations of thinly veiled threat are unfortunate and should be abandoned by everyone. She had an opportunity to go for the high ground but reverted to type instead, and is trying feeble, transparent denial.