# R

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## R,

18th letter of the alphabet**alphabet**

[Gr.

*alpha-beta,*like Eng. ABC], system of writing, theoretically having a one-for-one relation between character (or letter) and phoneme (see phonetics). Few alphabets have achieved the ideal exactness.

**.....**Click the link for more information. , corresponding to Greek rho. When in Latin alphabets the letters for

*p*and

*r*became similar in appearance, the rho form (P; which at first was used for the

*r*sound) was restricted to the

*p*sound, and an extra line was added for the

*r*sound (R). In Greek, where no confusion developed, the rho continued to look like Latin P. A modification of R is the symbol ℞, used medically for

*recipe*[Lat.,=take] and liturgically for

*responsum*[Lat.,=response].

## r

(nucleonics)

## R

(nucleonics)

## R

**1.**Abbr. for “radius.”

**2.**Abbr. for “right.”

**3.**Symbol for the capacity of a pile (for example, 3R indicates three times design capacity).

**4**. Symbol for the thermal resistance of a material or component of construction.

**5.**Symbol for electrical resistance.

## sound reduction index, R

British term for sound transmission loss.

## R

A programming language for statistical computing and graphics that is released under the GNU license. R was designed to handle a wide variety of complex statistical tasks, and many user-developed routines are also available. R is the open source version of S, which was developed in the mid-1970s by John Chambers at Bell Labs (S-PLUS was a commercial version from TIBCO Software). For more information, visit www.r-project.org.Want to thank TFD for its existence? Tell a friend about us, add a link to this page, or visit the webmaster's page for free fun content.

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