U-lock - significado y definición. Qué es U-lock
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Qué (quién) es U-lock - definición

TYPE OF LOCK USED TO SECURE BIKES
U-lock; U lock; Bike Lock; Bike lock; Bicycle Lock; Bikelock; Sold Secure; O-lock

U-lock         
¦ noun another term for D-lock.
Lock (water navigation)         
FALL STRUCTURE WITH A FIXED CHAMBER IN WHICH THE WATER LEVEL CHANGES
Canal locks; Ship lock; Lock (canal); Lock and dam; Shiplock; Navigation lock; Pound lock; Lock (river); Locks (canal); Canal lock; Locks (water transport); Sea lock; Gate (water transport); Lock (ship); Ship locks; Mitre gate; Staircase locks; Shaft lock; Twin lock; Sluse; Sluser; Canal Lock; Lock gate; Lock navigation; Stop lock; Lock gates; Lock flight; Lock-chambers; Shipping lock; Lock chamber; Staircase lock; Lock (waterway); Lock (water transport); Lock (waterwat transport); Dock gate; Lock (water); Drop lock; Flight of locks; Lock flights; Lock paddle; Lock rise; Double lock
A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls.
Lock (waltz)         
IN A WALTZ
Lock (Waltz); Back lock; Turning lock; Turning lock to right; Forward lock (waltz)
There are several types of lock step in waltz dancing, including International Standard waltz. A "lock step" is when the moving foot approaches to the standing foot and crosses in front of or behind it, creating a "check" position.

Wikipedia

Bicycle lock

A bicycle lock is a security device used to deter bicycle theft, either by simply locking one of the wheels or by fastening the bicycle to a fixed object, e.g., a bike rack.

Quick-release levers, as used on some bicycle wheels and seatpost fasteners, are a security vulnerability, because they allow the wheels and saddle to be easily removed. Unless such easily removable components are secured while the bicycle is unattended, they are vulnerable to theft. Sensible locking strategies address this by locking these components in addition to the frame, or by taking the vulnerable components, such as quick-release front wheels, away from the bicycle.

Locking devices vary in size and security, the most secure tending to be the largest, heaviest and least portable. Thus, like other security equipment, bicycle locks must balance the competing interests of security, portability, and cost. Some are made of particularly expensive materials chosen for their acceptable strength and low density.

An alternate defense is the provision of bicycle lockers or a bike cage in which the whole bicycle is locked, but these are uncommon in some countries. A bike locker is not a bicycle lock.

Test standards that rate the effective security of bicycle locks are provided by Thatcham and Sold Secure in the United Kingdom, ART in the Netherlands, SSF in Sweden, and VDS in Germany. Tests carried out by the Cyclists' Touring Club showed that all of the locks under test could be broken in less than 42 seconds using either bolt cutters for a cable/chain or a bottle jack for D-locks.

Ejemplos de uso de U-lock
1. Bike theft is a concern, and retailers say the only major lock manufacturer to offer a guarantee in the city is Kryptonite, maker of the New York Fahgettaboudit U–lock.