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en.wikipedia.org/wiki/Cephalopod_limb

Generally, arms have suckers along most of their length, as opposed to tentacles, which have suckers only near their ends. Barring a few exceptions, octopuses have eight arms and no tentacles, while squid and cuttlefish have eight arms (or two "legs" and six "arms") and two tentacles.

www.telegraph.co.uk/.../2547597/Octopuses-have-two-legs-and-six-arms.html

Octopuses have two legs and six arms To most of us it has always seemed obvious that an octopus has eight arms. Claire Little, a marine expert from the Weymouth Sea Life Centre in Dorset, ...

en.wikipedia.org/wiki/Octopus

A study of this behaviour led to the suggestion that the two rearmost appendages may be more accurately termed "legs" rather than "arms". Some species of octopus can crawl out of the water briefly, which they may do between tide pools while hunting crustaceans or gastropods or to escape predators.

www.thoughtco.com/fascinating-octopus-facts-4064726

The octopus is essentially a mollusk that lacks a shell but has eight arms and three hearts. Where cephalopods are concerned, marine biologists are careful to distinguish between "arms" and "tentacles." If the invertebrate structure has suckers along its entire length, it's called an arm; if it only has suckers at the tip, it's called a tentacle.

www.answers.com/Q/Does_an_octopus_have_8_arms_or_8_legs

octopuses are widely considered to have 8 legs however they actually have 6 , the other 2 are arms Not true. An octopus has 8 tentacles. But marine scientists now believe that only 2 of those ...

www.smithsonianmag.com/science-nature/ten-curious-facts-about-octopuses-7625828

5) Octopus arms have a mind of their own. Two-thirds of an octopus’ neurons reside in its arms, not its head. As a result, the arms can problem solve how to open a shellfish while their owners ...

www.answers.com/Q/Does_an_octopus_have_legs_or_tentacles

Surprisingly, an octopus has neither legs nor tentacles. It has arms, which have suction cups on the underside. Most people think they have tentacles, but common octopuses do not.

aqua.org/blog/2017/October/Cephalopods-Arms-or-Tentacles

Cephalopods: Arms or Tentacles? ... Cephalopods are a class of marine mollusks including the octopus, cuttlefish and squid. The name cephalopod means "head-foot" because they have limbs attached to their head, and these mollusks are well-known for their arms and tentacles. And while all cephalopods have arms, not all cephalopods have tentacles.

sciencing.com/suction-cups-octopus-called-8484250.html

What Are the Suction Cups on an Octopus Called? ... The suction cups on an octopus' arms are called suckers. The internal wall is the infundibulum, and the cavity in the center is the acetabulum. ... Each sucker is attached to the arm by a muscular base that can rotate the sucker in any direction and can elongate it to twice its normal length ...

www.dailymail.co.uk/.../How-arms-does-octopus-Only--legs-say-scientists.html

Ask anyone how many arms an octopus has and the usual answer will be eight. But scientists now insist these nautical animals only have six. In a new study they found that the creatures used six of ...