The word "crochet" is derived from the French word "croc" or "croche", meaning "hook". This is the action of creating fabric from a length of thread with a hooked tool. Crocheting starts by placing a slip-knot-loop onto a hook then pulling another loop through the first loop and so on to create a length of stitches called a "foundation chain". This chain is either turned and worked in rows, or joined end-to-end and worked in rounds. Stitches are made by pulling one or more loops through some or all of the loops in this chain. The way in which stitches are repeated creates a distinct pattern. Crochet is different to other methods of fabric-making as it is composed entirely of loops and is only secured when the free end of the thread is pulled through the final loop.
Crochet Guides includes useful information about threads and crochet hooks, and includes useful conversion charts from UK and US.
Crochet on the double, which may be called "cro-hooking", "reversible crochet" or "crochenit" is a crochet technique using a double ended crochet hook (cro-hook) which quickly produces a soft, knit-like fabric. This technique is similar to Tunisian (tricot or afghan) crochet but uses 2 or more colours of yarn and produces a soft, reversible finish. Stitches are drawn up through either the vertical or horizontal bars with the loops left on the hook (like knitting). When all loops are on the hook the work is turned, colour is changed and the stitches are taken off in 2's or 3's or as the pattern indicates. The yarn colour is changed every 2nd row so there are no ends to sew in later, just run them up the side of the work. Crochet on the double appears to be called "crochenit" when thicker yarn and hooks of 9mm or more (crochenit hooks) are used.
More information for Crochet on the Double.
Crochenit appears to be the same as crochet on the double (see above) when using thicker yarns and double ended hooks 9mm or thicker.
More information for Crochenit.
Crocheters can now add the delicate tatted rings and picots to their favourite articles. Cro-tatting blends the delicate look of tatting and the ease of crocheting with the use of a single cro-tat hook. This hook has an extended shaft of uniform thickness from the handle and holds the thread like a tatting needle. Change between cro-tatting and crochet all in the one article, using the same hook and still achieve the delicate tatted look. This technique can also be applied using yarn and a cro-tat master hook which features marked ¼" increments on the hook shaft to assist with formation of picots.
More information for Cro-tatting.
Tunisian crochet may be called "tricot crochet", "Afghan crochet", "shepherd's knitting", "hook knitting" or "railroad knitting". Tunisian crochet uses a tricot hook which is similar to a standard knitting needle with a hook rather than a point. Each row is made by placing loops on the hook and then working them off again. The work is not turned, so one side of work, usually the front, always faces you.
More information for Tricot crochet.
More information for Left Handed Knitting instructions compliments of Craft Moods