spin = S = splash screen

spl /S-P-L/

[abbrev, from Set Priority Level] The way traditional Unix kernels implement mutual exclusion by running code at high interrupt levels. Used in jargon to describe the act of tuning in or tuning out ordinary communication. Classically, spl levels run from 1 to 7; "Fred's at spl 6 today" would mean that he is very hard to interrupt. "Wait till I finish this; I'll spl down then." See also interrupts locked out.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

Sound Pressure Level, measured in dB (decibel) and defined as 20log10(P/R)

Where P is the measured pressure, and R = 2*10-5 Pa is the reference sound pressure.

How loud the sound is also depends on the frequency, as the human ear is less sensitive at certain frequencies.

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