There are places in Windows (or related technologies) where time is counted in 100-nanosecond units.

[`FILETIME`](https://msdn.microsoft.com/en-us/library/windows/desktop/ms724284(v=vs.85).aspx)

[`MFTIME`](https://msdn.microsoft.com/en-us/library/windows/desktop/dd979590(v=vs.85).aspx)

[`TimeSpan.TimeSpan(long)`](https://msdn.microsoft.com/en-us/library/zz841zbz(v=vs.110).aspx)

The `TimeSpan` constructor does call these "ticks" - but since [`GetTickCount`](https://msdn.microsoft.com/en-us/library/windows/desktop/ms724408(v=vs.85).aspx) counts milliseconds, this sounds more like a general term for short periods of time than anything specific.

I can describe these things as "100 nanosecond units", but this is a bit unwieldy when writing documentation and comments or naming variables. I can make a term up, but if there's a standard one, or even one that's just somewhat common, then I'd rather use that instead.