(Last modified Fri Jun 06 14:58 2008)

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It's Greek To Me

Greek letters

The Greek letters that are most often confused with Latin letters are:  β/B, ε/e, η/n, ι/i, κ/K, ν/V, ρ/p, τ/T, υ/u, χ/x, ω/w. 

The Greek letters I most commonly use in these web pages are, in order α β φ γ Γ Σ ε Φ δ χ Δ θ ω λ

Lower
case
Upper
case
Name in
English
American pronunciation cue
αΑalpha Like calendar, not like all
βΒbeta Like bay, not like bee
γΓgamma Like ham
δΔdelta Like bell
εΕepsilon Like step
ζΖzeta Like bay
ηΗeta Like bay
θΘtheta Like bay; unvoiced th like thick, not like they
ιΙiota Like eye then owe; stress on o
κΚkappa Like gap
λΛlambda Like lamb
μΜmu Like m followed by you, or (less commonly) moo
νΝnu Like zoo, no y sound
ξΞxi Like z followed by eye, or k followed by sigh
οΟomicron Like ah, middle, on; stress on o
πΠpi Like pie
ρΡrho Like row
σΣsigma Like signal
τΤtau Like cow
υΥupsilon Like oops; stress on up
φΦphi Like file
χΧchi Like k followed by eye
ψΨpsi Like p followed by sigh
ωΩomega Like oh, may; stress on me

It makes no sense to stress the o in omicron ("little O") but not in omega ("big O"), but there you are, that's what Americans seem to do.  British pronunciation is at least consistent:  omicron (oh-my-kron). 

Other symbols and words that often cause problems

Ab
Usually things like this are pronounced "A sub b". 
A, a
If both cases appear in the same equation, it is common to hear people say "big A" and "A" (but usually not "little A" except for emphasis). 
analyses
Plural of analysis.  One analysis, two analyses.  Pronounced "an-AL-is-eez".  Of Greek origin (thus the plural and the stress on the third-to-last syllable). 
automata
The plural of automaton.  One automaton, two automata.  It is somewhat rare to see automatons.  Of Greek origin (αυτοματον).
axes
Plural of axis.  One axis, two axes.  Pronounced "AX-eez".  Of Latin origin (but probably originally Greek). 
complement
Sometimes confused with the related word "compliment".  Mathematical uses take "complement" spelled with the 'e'. 
correspondence
Sometimes confused with the related word "correspondance".  Mathematical uses take "correspondence" spelled with the 'e'. 
criterion / criteria
One criterion, two criteria.  The OED mentions 'criterions' as 'uncommon' (it's very uncommon).  There is no such word as 'criterias'. Of Greek origin. 
extremum / extrema
One extremum, two extrema.  It is rare to see extremums.  Of Latin origin.
rational vs. rationale
A number can be rational (if it's the ratio of two integers);  a person can be rational (if he or she is thinking logically and clearly), his or her argument can be rational (if it's clear and logical), and a choice he or she makes can be rational (if the argument in favor of that choice is clear, cogent, and more convincing than the arguments for the alternative choices. 

However, the reasons for making a choice are its rationale.  Pronounced RA-shu-NAAL.  Rhymes with "pal" and "shall", but the "nale" syllable lasts a little longer. 

schemata
The plural of schema (although schemas is also common).  One schema, two schemata.  Of Greek origin (σχημα), thus the plural in -ta and the stress on the third-to-last syllable sche, like automaton is also stressed on its third-to-last. 
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Assistant Professor, Informatics Dept.
School of Information and Computer Sciences