The character width (single vs. double cell) is not defined by the font.
Instead, it is defined by the Unicode database and the matching locale
definitions.

Some characters are of ambiguous width. They occupy a single cell by
default, but gnome-terminal can be configured so that they occupy two
cells. In your particular example the three arrows (the triangle and two
"normal" arrows) are of this kind. Note however that there's no matching
locale on Linux systems, so fullscreen applications are expected to fall
apart if you do this. (See also
https://bugzilla.gnome.org/show_bug.cgi?id=749414.)

To enable this, launch gnome-terminal with the VTE_CJK_WIDTH=1
environment variable. In newer gnome-terminal versions this has been
moved to a profile preference under the Compatibility tab.

As far as the other symbols (e.g. flag) are concerned, they are
apparenty wider in your font than the rest of the symbols, hence the
font is lying about being monospace. Maybe gnome-terminal (vte,
actually) could do a better job in fitting these symbols in the cell,
but maybe that'd do more harm than good, I don't know.

** Bug watch added: GNOME Bug Tracker #749414
   https://bugzilla.gnome.org/show_bug.cgi?id=749414

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https://bugs.launchpad.net/bugs/1570533

Title:
  wrong character width with Ubuntu Mono and replacement fonts in gnome-
  terminal:

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