high & low (single capital characters)

[drhaggis]

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I'm working on a LCD display that only has monotonic capital letters, and I need a single character to represent that an electrical signal has gone "high" or turned "on." In English we use "H" and "L," for example.

Thank you for your time.

[billberg23]

And the universal symbols "|" and "O" won't work in this context?

[drhaggis]

No, those are symbols for Power On/Off for a device, I'm presenting the state of multiple signals.

I'm using the numbers 1 and 0 right now, which is suitably universal, but we usually use letters. Our Spanish application uses "S" and "N" for example.  I'm still curious what the Greek letters would be.