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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