I downloaded the SVG Outline from the link you provided and exported it to a TikZ path using Inkscape. Here is the result after some adjustments by hand:
\documentclass{article}
\usepackage{tikz}
\newcommand\spiral{%
\begin{tikzpicture}[y=.009ex,x=.009ex,yscale=-1]
\path[fill] (74.2500,379.5469) -- (62.4375,373.3594) .. controls
(83.4375,365.2031) and (99.6563,356.1563) .. (111.0938,346.2188) .. controls
(122.5313,336.2813) and (131.0625,324.9375) .. (136.6875,312.1875) .. controls
(142.3125,299.4375) and (145.1250,284.4375) .. (145.1250,267.1875) .. controls
(145.1250,256.6875) and (141.9375,247.5000) .. (135.5625,239.6250) .. controls
(129.1875,231.7500) and (121.7813,226.3125) .. (113.3438,223.3125) .. controls
(104.9063,220.3125) and (95.6250,218.8125) .. (85.5000,218.8125) .. controls
(75.3750,218.8125) and (66.0937,220.3125) .. (57.6562,223.3125) .. controls
(49.2187,226.3125) and (41.8125,231.7500) .. (35.4375,239.6250) .. controls
(29.0625,247.5000) and (25.8750,256.6875) .. (25.8750,267.1875) .. controls
(25.8750,277.6875) and (27.3750,286.9687) .. (30.3750,295.0312) .. controls
(33.3750,303.0937) and (38.1563,308.9063) .. (44.7188,312.4688) .. controls
(51.2813,316.0313) and (59.2500,317.8125) .. (68.6250,317.8125) .. controls
(73.6875,317.8125) and (77.5782,316.7813) .. (80.2969,314.7188) .. controls
(83.0156,312.6563) and (85.2187,309.7500) .. (86.9062,306.0000) .. controls
(88.5937,302.2500) and (89.4375,297.3750) .. (89.4375,291.3750) .. controls
(89.0625,288.3750) and (88.4063,285.6563) .. (87.4688,283.2188) .. controls
(86.5313,280.7813) and (85.0313,278.9063) .. (82.9688,277.5938) .. controls
(80.9063,276.2813) and (78.3750,275.6250) .. (75.3750,275.6250) .. controls
(72.9375,275.6250) and (70.5469,277.1250) .. (68.2031,280.1250) .. controls
(65.8594,283.1250) and (63.7500,288.4219) .. (61.8750,296.0156) --
(57.6562,295.8750) .. controls (55.5937,295.8750) and (54.0937,295.4063) ..
(53.1562,294.4688) .. controls (52.2187,293.5313) and (51.7500,292.5000) ..
(51.7500,291.3750) .. controls (51.7500,286.5000) and (52.6875,281.7187) ..
(54.5625,277.0312) .. controls (56.4375,272.3437) and (59.2500,268.5000) ..
(63.0000,265.5000) .. controls (66.7500,262.5000) and (70.8750,261.0000) ..
(75.3750,261.0000) .. controls (80.6250,261.0000) and (85.4063,262.1250) ..
(89.7188,264.3750) .. controls (94.0313,266.6250) and (97.4063,270.0937) ..
(99.8438,274.7812) .. controls (102.2813,279.4687) and (103.5000,285.0000) ..
(103.5000,291.3750) .. controls (103.5000,299.6250) and (102.3750,306.5625) ..
(100.1250,312.1875) .. controls (97.8750,317.8125) and (94.0313,322.5937) ..
(88.5938,326.5312) .. controls (83.1563,330.4687) and (76.5000,332.4375) ..
(68.6250,332.4375) .. controls (57.3750,332.4375) and (47.0625,329.8125) ..
(37.6875,324.5625) .. controls (28.3125,319.3125) and (21.5625,311.5313) ..
(17.4375,301.2188) .. controls (13.3125,290.9063) and (11.2500,279.5625) ..
(11.2500,267.1875) .. controls (11.2500,254.0625) and (14.2500,241.9687) ..
(20.2500,230.9062) .. controls (26.2500,219.8437) and (35.1563,211.3125) ..
(46.9688,205.3125) .. controls (58.7813,199.3125) and (71.6250,196.3125) ..
(85.5000,196.3125) .. controls (99.3750,196.3125) and (112.2187,199.3125) ..
(124.0312,205.3125) .. controls (135.8437,211.3125) and (144.7500,219.8437) ..
(150.7500,230.9062) .. controls (156.7500,241.9687) and (159.7500,254.0625) ..
(159.7500,267.1875) .. controls (159.7500,287.4375) and (156.5625,304.7813) ..
(150.1875,319.2188) .. controls (143.8125,333.6563) and (134.0625,346.1250) ..
(120.9375,356.6250) .. controls (107.8125,367.1250) and (92.2500,374.7656) ..
(74.2500,379.5469) -- cycle;
\end{tikzpicture}%
}
\begin{document}
\Huge A\spiral B
\LARGE A\spiral B
\Large A\spiral B
\large A\spiral B
A\spiral B
\small A\spiral B
\footnotesize A\spiral B
\scriptsize A\spiral B
\tiny A\spiral B
\end{document}

Even though you don't want to use XeLaTeX, this might be useful to someone else. The Code2000 font (shareware with odd license) and Noto Sans Cham possess this particular character. You may use it like
\fontspec{CODE2000.TTF}꩜
or
\fontspec{CODE2000.TTF}^^^^aa5c
Here is a comparison of the fake TikZ symbol with the one from Code2000 and from Noto Sans Cham:

Because Noto Sans Cham only covers the Cham range of Unicode the Latin letters are missing and replaced by rectangles.
\spiral
but\spiral
isn't defined.\includegraphics[height=1em]{spiral}
?