Lots of choices with Unicode, including ⌚ and ⌛!
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← ↖ ↑ ↗ → ↘ ↓ ↙ -
▁ ▂ ▃ ▄ ▅ ▆ ▇ █ ▇ ▆ ▅ ▄ ▃ ▁ -
▉▊▋▌▍▎▏▎▍▌▋▊▉ -
▖ ▘ ▝ ▗ -
┤ ┘ ┴ └ ├ ┌ ┬ ┐ -
◢ ◣ ◤ ◥ -
◰ ◳ ◲ ◱ -
◴ ◷ ◶ ◵ -
◐ ◓ ◑ ◒ -
◡◡ ⊙⊙ ◠◠ -
⣾⣽⣻⢿⡿⣟⣯⣷ ⠁⠂⠄⡀⢀⠠⠐⠈The entire braille block, even in random order http://www.fileformat.info/info/unicode/block/braille_patterns/images.htm