Use "SCND" for field names relating to number two in a countable series (or 2nd)
Use "SS" for field names relating to a duration of time expressed in seconds
cc/sc
There are two widely accepted and recognized ways to abbreviate electronics. The first is "elec" and the second is "electr".
The standard abbreviation for second is 's' (not 'sec')
it is ms. m is milli, s is second
2nd St.
i abbreviate it as advs. You could also abbreviate it as adv.
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In medical terms you can abbreviate it to "Tx" like you abbreviate History to "Hx"
You cannot abbreviate the number.
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