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Appendix A – Abbreviations: Standard Abbreviations X x XCV X,Y,Z by (as in “8-1/2 x 11”) transceiver orthogonal leads Y Y yr yrs YY year, yellow year years year Symbols ↑ µ µF µs, µsec 68K & # °C °F Ω % > < ± * 12SL A-12 SHIFTed or alternate function micro microfarad microsecond 68000 and number degrees Celsius degrees Fahrenheit Ohm, ohm percent registered greater than less than plus or minus An asterisk after a signal name indicates the signal is active at its relatively lower potential, or “active-low.” Signals without the asterisk suffix are active at their relatively higher potential, or “active-high.” 12 simultaneous leads MAC 5000 resting ECG analysis system 2017803-003 Revision C