Quick answer
Uniform is the red-and-white quartered flag for U in the International Code of Signals. Its single-letter message is “You are running into danger.” The Republic of Singapore Navy confirms this meaning in its official flag guide.
| Feature | Evidence-supported description |
|---|---|
| Letter and name | U — Uniform |
| Pattern | Red-and-white quartered flag. |
| Outline | Square in the International Flags and Pennants recognition chart; this does not establish a universal manufacturing requirement. |
| Colour specification | Red and white are identified; no verified Pantone, RGB, HEX or textile colour tolerances are supplied here. |
| Manufacture | No verified dimensions, seam allowances, fabric requirements or attachment specifications are established by the evidence used for this record. |
Construction and reproduction
The U.S. International Code of Signals recognition chart supports identification of the quartered pattern. It is not treated here as a dimensioned fabrication drawing. Exact geometry and colour values must not be measured from its artwork and presented as official specifications.
No common manufactured ratio is asserted without a supporting procurement or manufacturing standard. A screen approximation or editorial reconstruction would need to be labelled accordingly.
Documented use and evidence limits
The Republic of Singapore Navy’s guide, updated on 22 July 2025, presents Uniform as part of international ship-to-ship communication. This supports its contemporary use, but does not establish when the design or warning was first adopted. No original adoption date or earlier wording is asserted here.