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A 'WIND-T' or 'TETRAHEDRON' on the airport indicates

Choices

the airport elevation.
Elevation is published, not on a wind T.
✓ the wind direction.correct
A wind-T or tetrahedron shows the wind direction: the device pivots so the small end (tetrahedron) or vertical of the T points INTO the wind (i.e., the runway in use is into the wind, parallel to the indicator's pointing direction). Wind direction indicators on the field: wind sock (most common, blows away from wind, larger end with the wind), tetrahedron (small end points into wind), wind T (vertical bar points into the wind). Use these to determine the active runway at non-towered fields. Always confirm with CTAF traffic announcements.
the runway numbers.
Runway numbers are painted on the runway.
where to park.
Parking is indicated by other signs.

Why

A wind-T or tetrahedron shows the wind direction: the device pivots so the small end (tetrahedron) or vertical of the T points INTO the wind (i.e., the runway in use is into the wind, parallel to the indicator's pointing direction). Wind direction indicators on the field: wind sock (most common, blows away from wind, larger end with the wind), tetrahedron (small end points into wind), wind T (vertical bar points into the wind). Use these to determine the active runway at non-towered fields. Always confirm with CTAF traffic announcements.

FAA source: AIM 4-1-9, AC 150/5210-5; AIM 4-1-9 Traffic Advisory Practicesbrowse the reference library →

Covered in Supplemental · III — Airport & Seaplane Base Operations — study the lessons free, then practice with grading and mastery tracking.

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Original study question written for this course — representative of FAA knowledge-test topics, not an actual current FAA exam question. Reviewed by a panel of three CFIs + AI review.