Pursuant to the law 155/1998 Sb. the Sign Speech (SS) means Czech Sign Language and Signed Czech. The article 4 specifies the Czech Sign Language (CSL) as follows:
The article 5 specifies the Signed Czech (SC) as follows:
The basic unit of the sign language is the sign (it corresponds broadly to the individual word (concept) in spoken language, but this is not always true!). Every sign has two parts: nonmanual and manual part. The nonmanual part is expressed by facial expressions, movements and positions of the head and upper part of the torso. The manual part is expressed by shapes, movements and positions of the hands. The signs are realized in sign space, which is delimited by outspread elbows, crown and line leading under the stomach. The main difference between the Czech language and CSL results from the different way of perception. CSL is visual-spatial language, i.e. this language is not perceived by hearing but sight.