Definition
A NOTAM contraction used to indicate that something exists in only one instance — one runway, one frequency, one approach, one item — as opposed to multiple.
Plain English
A short way of writing the word "single" in NOTAMs and other FAA shorthand.
Context Anchor
Seen in FAA abbreviation lists and in compact aviation notices where words are shortened to save space.
Derivation
Single comes from a Latin word meaning one at a time or one by one. That origin matches the aviation use: SNGL points to one thing, not a group.
Why Pilots Care
Reading SNGL correctly helps a pilot avoid assuming that a notice applies to several items when it actually applies to only one.
Intuition Check
SNGL does not automatically mean single-engine or solo flight. Here it simply means one, unless the surrounding text clearly says what the one item is.
Example Sentence 1
The NOTAM described a SNGL runway closure at the destination airport.
Example Sentence 2
The NOTAM stated SNGL runway open for operations.