tests

Rename "symbol" term to "element" #479

Job	Run time
Tests (8.1, ubuntu-latest, prefer-lowest)	12s
Tests (8.1, ubuntu-latest, prefer-stable)	17s
Tests (8.1, macos-latest, prefer-lowest)	1m 38s
Tests (8.1, macos-latest, prefer-stable)	1m 24s
Tests (8.1, windows-latest, prefer-lowest)	36s
Tests (8.1, windows-latest, prefer-stable)	38s
Tests (8.2, ubuntu-latest, prefer-lowest)	13s
Tests (8.2, ubuntu-latest, prefer-stable)	15s
Tests (8.2, macos-latest, prefer-lowest)	1m 14s
Tests (8.2, macos-latest, prefer-stable)	1m 47s
Tests (8.2, windows-latest, prefer-lowest)	10m 53s
Tests (8.2, windows-latest, prefer-stable)	45s
Tests (8.3, ubuntu-latest, prefer-lowest)	18s
Tests (8.3, ubuntu-latest, prefer-stable)	17s
Tests (8.3, macos-latest, prefer-lowest)	1m 55s
Tests (8.3, macos-latest, prefer-stable)	1m 36s
Tests (8.3, windows-latest, prefer-lowest)	34s
Tests (8.3, windows-latest, prefer-stable)	42s
Tests (8.4, ubuntu-latest, prefer-lowest)	14s
Tests (8.4, ubuntu-latest, prefer-stable)	19s
Tests (8.4, macos-latest, prefer-lowest)	1m 52s
Tests (8.4, macos-latest, prefer-stable)	1m 40s
Tests (8.4, windows-latest, prefer-lowest)	38s
Tests (8.4, windows-latest, prefer-stable)	38s
	30m 35s

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