http://hu.wikipedia.org/wiki/Vipera_(fegyver)

A vipera - a rendőri szakzsargon szerint teleszkópos bot - acélból készült veszélyes kézifegyver, amellyel bénító ütést lehet mérni, de akár halálos sérülést is okozhat. Az acélbot végén egy pár centis acélgömb van, ami által az ütés ereje megsokszorozható, és így kis pontra koncentrálódik az ütés ereje, ezáltal súlyosabb sérülést okoz.

http://en.wikipedia.org/wiki/Baton_(law_enforcement)#Expanda...
An expandable baton (also referred to variously as a collapsible baton, telescopic [or telescoping] baton, tactical baton, spring cosh, asp, Extendable, or extendo [slang]) is typically composed of a cylindrical outer shaft containing telescoping inner shafts (typically 2 or 3, depending on the design) that lock into each other when expanded. The shafts are usually made of steel, but lightweight baton models may have their shafts made from other materials such as aluminium alloy.

Expandable batons may have a solid tip at the outer end of the innermost shaft; the purpose of the solid tip is to maximize the power of a strike when the baton is used as an impact weapon.

Expandable batons are made in both straight and side-handle configurations, but are considerably more common in the straight configuration.

The best-known example of the straight expandable baton is the ASP (Armament Systems and Procedures) Baton, which has become a genericized trademark within the law enforcement and security communities for this type of product.