Hwaran symbol

Eight elements (Trigram Figure) surrounding square are symbolized with eight animals (馬 horse, 羊 sheep or goat, 雉 pheasant, 龍 dragon, 雞 fowl, 豕 pig, 狗 wolf or dog, 牛 cow).
You can understand it deeply in a table below.

Trigram Figure	Name	Translation:Wilhelm	Image in Nature	Direction	Family Relationship	Body Part	Attribute	Stage/ State
☰	乾 qián	the Creative, Force	heaven, sky 天	northwest	father	head	Strong	Creative
☱	兌 duì	the Joyous, Open	swamp, marsh 澤	west	third daughter	mouth	pleasure	tranquil (complete devotion)
☲	離 lí	the Clinging, Radiance	fire 火	south	second daughter	eye	light-giving, dependence	clinging, clarity, adaptable
☳	震 zhèn	the Arousing, Shake	thunder 雷	east	first son	foot	inciting movement	initiative
☴	巽 xùn	the Gentle, Ground	wind 風	southeast	first daughter	thigh	penetrating	gentle entrance
☵	坎 kǎn	the Abysmal,Gorge	water 水	north	second son	ear	dangerous	in-motion
☶	艮 gèn	Keeping Still, Bound	mountain 山	northeast	third son	hand	resting, stand-still	completion
☷	坤 kūn	the Receptive, Field	earth 地	southwest	mother	belly	devoted, yielding	receptive
Table form http://en.wikipedia.org/wiki/I_ching

Square are material realization symbol with fire and water (red and blue) for guarding mind and body.  Symbol in circle is spiritual foundation representing duality(blue and red part of symbol) and ever present unity behind and in duality (white part of symbol).

Symbolisms of 8.element are also...
 

	KEON/Heaven
The associated trigram represents Yang, or male/positive energy. The concept behind the form is that of the universe giving birth to the cycle of life. As the Tao reminds us, with an end comes a new beginning. Just as night becomes day.
	TAE/Strength of Mind
The underlying concept of Tae is external gentleness belying internal strength, often characterized by the maxim of the iron fist in the velvet glove. As our confidence and power increase, we paradoxically become more calm, gentle and reasonable.
	RI/Fire
Ri, means fire, sun and light. Literally, the sun contains immense energy, and of course intensity. Metaphorically, fire represents the passion of a martial artist at this advanced beginner stage.
	JIN/Thunder
Most powerful forces of nature. Represents grace, power, courage and perseverance.
	SEON/Wind
Wind can be a gentle breeze which caresses everything it touches, yet as it grows in intensity it gains power and destructive force. If it reaches hurricane force it destroys everything in its path. The true hwaranchi understands that it is necessary to harness this paradoxical strength and weakness: the stronger and more powerful we become through our hwaran training, the more peaceful and calm we should become. This is the essence of the Tao - the Way.
	KAM/Water
Water, which quietly carves out canyons and mountains, reflects the concept of a flexible mind and a flexible body. Like anything in nature, we must remain flexible if we are to survive. Water teaches us that explosive force and power is not the only way, and by now you should understand the importance of seeking the path of least resistance. The power of water mirrors one of hwaranchi core values: indomitable spirit. Water can be still, clear, calm and reflective, and as we train we seek these characteristics for our minds. Yet water also retains ultimate flexibility and flowing power, and these are characteristics we seek for our bodies.
	KAN/Mountain
Mountains are the most majestic expressions of our natural environment, and they clearly represent permanence, wisdom, strength, spirit, stability and solidity.
	KON/Earth
Kon means earth, and the associated trigram (three broken lines) is um/yin. Earth provides us with birth, and sustains is in life, and all lives must return to where they begin - earth. Yet the circle of life also provides renewal and rebirth.
Symbolisms text from:  http://www.hrksf.com/taekwondo/students/taegeuk/taegeuk2/taegeuk2.html