The United States Navy, United States Coast Guard, and United States National Oceanic and Atmospheric Administration (NOAA) use a hull classification symbol (sometimes called hull code or hull number) to identify their ships by type and by individual ship within a type.

The list of hull classifications comprises an alphabetical list of the hull classification symbols used by the United States Navy to identify the type of a ship. The combination of symbol and hull number identify a modern Navy ship uniquely.

美国海军通用舰船分类符号（US Hull Classification Symbols）是美国海军及其北约用来识别不同类别的舰船的代号。 英国皇家海军和其他的欧洲国家的海军也用极为相似的代号来表明不同类别的战舰和海军战船舷号系统。

2018年8月31日 · Before that date, the USN had a classification of "frigate" with the hull symbol DL(G), which can be read as "destroyer leader" or "destroyer, large". These were ships that were bigger and better-armed than destroyers, but not up to the traditional standards of cruisers .

2022年4月12日 · A Hull Classification Symbol (abbrev: HCS) is a method of naval vessel identification used by the Royal Manticoran Navy, the Grayson Space Navy, the Imperial Andermani Navy, and the Republic of Haven Navy.

2025年3月18日 · The following is a list of US Navy Service Craft based on the chosen Hull Class.

2024年10月25日 · Ship Hull Marking Summary. Thousands of commercial ships travel across international seas, carrying billions of tons of cargo annually and handling more than 80% of global trade. The best people to observe and comprehend these hull symbols are tugboat captains and other people who are personnel in ports or on the sea.

2015年12月2日 · The closed convex hull is denoted by $\bar{\text{co}}(S) = \bar{\text{co}}\ S$. I think it depends more on the bibliography you follow. I think this notation is due to Francis H. Clarke.

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The list of hull classifications comprises an alphabetical list of the hull classification symbols used by the United States Navy to identify the type of a ship. The combination of symbol and hull number identify a modern Navy ship uniquely. A heavily modified or …