Ulu:  An all-purpose knife traditionally used by Eskimo women, both Yupik and Inuit.  The word Ulu actually means “women’s knife” It is utilized in applications as diverse as skinning and cleaning animals, cutting a child's hair, cutting food and, if necessary, trimming blocks of snow and ice used to build an igloo.  A variety of material was used for the blade such as bone, wood, and antler.  Today, however, the blade is normally steel but the handle is often bone, caribou antler, or wood. The knife is of a nontraditional shape, similar to a wide axe head with a handle located behind and parallel to the blade.

Uncle Harry:  A brand of knives made in Pakistan with a name similar to the Schrade family name Uncle Henry.  Do not confuse the two brands.

Uncle Henry:  A line of knives produced by Imperial Schrade, part of Taylor Brands, LLC.

Uncle Lucky:  One of the Frost Family line of knives. The name refers to a nickname given to Jim Frost by nephews of Kevin Pipes of SMKW fame.

Unique:  An often ill-defined and therefore meaningless term used to sell knives; especially online.

Un-X-Led: Pronouned Unexcelled, a trademark of Northfield/Great Eastern Cutlery. 

Upswept Skinner:  A style of fixed blade hunting knife with a spine swept upward leading the point being higher that the handle of the knife. The Some are radically curved other less so. The purpose is to allow for more productive skinning of animals than a straight blade. Compare to trailing point.

U.S. Army: Not to be confused with the actual branch of service, U.S. Army is a brand associated with Taylor Brands LLC. And Schrade. They are produced in China. Their U.S. Army tactical folders use 400A Stainless. The fixed blade use 1070 Carbon. These are NOT Army issue but are officially licensed by the U.S. Army in the same way the NFL or NASCAR officially licenses a product. It is just a brand name.

Utility Knife: 
1) Utility knife was a term sued by the U.S. Military beginning shortly before World War II for the four blade camp knife that had a spear master blade, a can opener, punch, and bottle opener/screwdriver. The term was later used for the Stainless steel sided 4 blade camp knives that lacked bolsters. Eventually the Boy Scouts of American adopted the name Utilty Knife to describe their 4 blade Knifes with smooth plastic scales and no bolsters from the original Camp Knife featuring bolsters and jigged delrin scales.

2) Any type of knife designed to be used as a tool and not as a weapon, including, box cutters, pruners, electrician knives, etc.

USA: Knives made in the United States are often stamped USA or a city and state within the US.

Utility Fish Knife: Normally any number of fixed blade knives, other than fillet knives that are designed for among anglers. The definign feature is normally a fish scaler located along the spine of the knife. Utitliy fish knives are normally but not always heavier and larger than Bird & Trout Knives. (See also Puuko, Bait Knife, Bird & Trout, Fillet knife)