sigma

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σ

, Σ
1. The 18th letter of the Greek alphabet, sigma.
2. (σ) Symbol for reflection coefficient; standard deviation; a factor in prokaryotic RNA initiation; wavenumber; surface tension.
3. (Σ) Summation of a series.

sig·ma

(sig'mă),
The 18th letter of the Greek alphabet, σ.

sigma

(sĭg′mə)
n.
A sigma factor.

sig′mate′ (-māt′) adj.

sigma

[sig′mə]
Σ, σ, and s, the eighteenth letter of the Greek alphabet.

σ

Abbreviation for standard deviation; reflection coefficient.

sig·ma

(σ,Σ) (sig'mă)
1. The 18th letter of the Greek alphabet.
2. (σ) reflection coefficient;standard deviation; a factor in prokaryotic RNA initiation; surface tension
3. (Σ) Summation of a series.

sig·ma

(sig'mă)
1. The 18th letter of the Greek alphabet (σ, Σ).
2. (σ) reflection coefficient; standard deviation; a factor in prokaryotic RNA initiation; surface tension
3. (Σ) Summation of a series.

sigma

the Greek letter σ or σ; the former frequently denotes a standard deviation, the latter is used in mathematics for the sum of the values of the term nominated.
References in classic literature ?
At the porter's lodge he stopped; the two men were still standing on the portico.
An occasional oil lamp at the corner of a street, or in the portico of some wealthy burgher, threw a faint glimmer over the shining cobblestones, and the varied motley crowd who, in spite of the weather, ebbed and flowed along every highway.
184-211) Soon they came to the house of heaven-nurtured Celeus and went through the portico to where their queenly mother sat by a pillar of the close-fitted roof, holding her son, a tender scion, in her bosom.
said her ladyship, descending from the carriage with ponderous grace, and addressing herself to Geoffrey, lounging under the portico of the house.
At length, the conveyance in which she had come rolled off too with its load, and the four worthies, being left alone under the portico, enjoyed a hearty laugh together.
Beneath it he discerned the dismantled ramparts of a town; here the still intact arch of a portico, there two or three columns lying under their base; farther on, a succession of arches which must have supported the conduit of an aqueduct; in another part the sunken pillars of a gigantic bridge, run into the thickest parts of the rift.
I did but exchange a few words with them, just outside the portico, inhaling the fresh, bracing air as I stood, and then, resisting the earnest and eloquent entreaties of all three to stay a little longer, and join them in a walk round the garden, I tore myself away and returned to my patient.
Hamel and Gerald stood under the great stone portico, watching.
She paused for a few moments in the portico to finish buttoning her gloves.
There was a kind of portico or colonnade outside, and this obstructed even the little light that at the best could have found its way through the small apertures in the door.
A great square house, with a heavy portico darkening the principal windows, as its master's heavy brows overshadowed his eyes.
He tottered across the lawn; climbed the steps; knocked faintly at the door; and, his whole strength failing him, sunk down against one of the pillars of the little portico.