Inflation tattoo

Maybe the surgical team will get a chuckle out of it.

I would never want to brand myself.

However, if forced; all I can think of that would be subtle and simple:

He
or
O2

in fancy shmancy letters.

Going further:
With a possible "Sn" or Jupiter Alchemy Symbol thrown on there.
Coincidence that the 2 jumbled words in my name I put together made a reference to the GAS giant.

If no one else is gonna see it, why bother? Honest question.

SCUBA divers use a red flag with a diagonal white stripe to mark their location, the float holding the flag warns boaters clear of the area. It is known as a "diver down" flag. Plenty of inflation stories and art make use of SCUBA gear. Map that flag onto a simple sphere to give it inflated dimension. Only you will know that it is a "diver blown up" flag. You are a fan of air inflation, yes? It is even more fitting if you happen to be a diver, and the image is clean and simple, like a computer icon.

Dive flags are half-blue and white here.

In commercial diving we use a term, "DeltaP", for differential pressure. I've thought of that as a new username for myself, but since I've had the same incongruous if not forgettable handle for nearly a decade I've yet to act on it. The good thing about it to me is it's a two-way thing in a sense and thus doesn't necessarily specifically denote being inflater, inflatee or both, so it can encompass the lot. As far as I know this has not been mentioned in this community since it's a very obscure reference (even recreational divers would not normally be familiar with the term).

As I began reading the topic I thought a valve would be a good possibility. Then I read on and saw just that - one clever idea pre-trounced.

A couple of others right under your nose of course would be I-123 or some other possibly apt derivative, or simply ...ssss.... either maybe incorporating a symbol(just to get the obvious out of the way).

Given the reason for the tattoo in this case, I would heartily suggest doing some legwork with regard to some kind of an appropriate design for an inflation-related Talisman symbol. It would certainly be a little abstract and at least slightly complex, but no more than most any other tattoo image. As a bonus it could well be aesthetically quite pleasing as a tattoo without being overtly obvious in theme (though it could incorporate valves, tubes, cylinders etc).

That's all I've got for now (it's late) but I'll doodle some images and if anything comes of it, or any other ideas surface, I'll post up here.

Google image search brings up some examples of various crafted symbols worn around the neck and so on. Also used as a token of sorts for someone who has passed through a rite of passage. It's also not so unlike a crest or coat of arms for a clan, family etc I suppose.

Wiki brings up all sorts of things as it's been used in a bunch of ways, but gist of it is at the top. There's plenty of other good explanations in various online dictionaries and the like. This one is pretty good - http://www.ka-gold-jewelry.com/new-design/p-articles/talismans.php

Although there's a fair few religious examples, the concept has been common to pretty much every culture there's ever been, from Scout badges to pyramids you might say.

I'm toying with a circular symbol here, just to try to kick off some drawing again, which incorporates a few relevant elements into a stylised image (one of which looks a bit like a valve inset in a set of symbols not unlike those used in a technical manner like with various fittings and components).