Is it possible to get a downward pointing solid triangle plotting symbol in R?

Thanks again Jan.? That is lovely and clean and I probably should have 
seen that option.

I had anxieties about the portability of using text.? (The function will 
end up in my
https://github.com/cpsyctc/CECPfuns package so I'd like it to be fairly 
immune to character
sets and different platforms in different countries.

I'm morphing this question a lot now but I guess it's still on topic 
really.? I know
I need to put in some time to understand the complexities of R and 
platforms (I'm
pretty exclusively on Linux, Ubuntu or Debian now so have mostly done 
the ostrich thing
about these issues though I do hit problems exchanging things with my 
Spanish speaking
colleagues).? Jan or anyone: any simple reassurance or pointers to 
resources I should
best use for homework about these issues?

TIA (again!)

Chris

You are right, sorry.

Another possible solution then: use geom_text instead of geom_point 
and use a triangle shape as text:

ggplot(data = tmpTibPoints,
?????? aes(x = x, y = y)) +
? geom_polygon(data = tmpTibAreas,
?????????????? aes(x = x, y = y, fill = a)) +
? geom_text(data = tmpTibPoints,
???????????? aes(x = x, y = y, label = "?", color = c),
???????????? size = 6) + guides(color = FALSE)

[much snipped]

Chris Evans (he/him)
Visiting Professor, UDLA, Quito, Ecuador & Honorary Professor, 
University of Roehampton, London, UK.
Work web site: https://www.psyctc.org/psyctc/
CORE site: http://www.coresystemtrust.org.uk/
Personal site: https://www.psyctc.org/pelerinage2016/